if the replacement part is just the ssd, yes you can firmly ask him to install w10 pro.

the digital license from w10 free upgrade is valid for as long as your pc can last. i have done many times of fresh installs with different new ssds since the free upgrade.

there is no need to use your w7 key. skip all the product number requests during w10 installation. once it's done, connect to the internet and it will be activated automatically.